Beer cans, Scotch tape, Super Glue... man-oh-man, this sho 'nuf is a congress of expert craftsmen!
ed I consider all the above much better than you had done to all those old American doubles that were case colored with a torch. Everthing in the list is easily reversible, just remove the tape or the shim and clean off the glue. If the torching ruined those actions on the guns you sold and some poor sucker winds up with a bad receiver he has a very expensive bill coming to put the gun right. Probably more than the gun would be worth when he got done.
